Display device and information processing apparatus

ABSTRACT

A display device having at least a display circuit for displaying an image, and a light receiving sensor for detecting a light disposed is provided. When a light receiving circuit region including the light receiving sensor is made a dark portion, and a region other than the light receiving circuit region is made a light portion, the display circuit and the light receiving sensor are disposed so that a spatial frequency of a repetitive pattern of the light portions and the dark portions becomes equal to or higher than 10 cpd.

CROSS REFERENCES TO RELATED APPLICATIONS

The present application claims priority to Japanese Patent ApplicationJP 2006-276043 filed in the Japan Patent Office on Oct. 10, 2006, and JP2007-238186 filed in the Japanese Patent Office on Sep. 13, 2007, theentire contents of which is being incorporated herein by reference.

BACKGROUND

The present application relates to a display device and an informationprocessing apparatus using the same. More particularly, the applicationrelates to a display device and an information processing apparatus witha light receiving function which is capable of maintaining a displayquality even when a light receiving resolution is made lower in levelthan a display resolution.

A display device is proposed which has a display circuit and a lightreceiving circuit disposed on the same substrate, which displays thereonan image, and which can receive a light from the outside. This displaydevice, for example, is described in Japanese Patent Laid-open Nos.2000-19478 and 2006-127212. The light receiving circuit of the displaydevice detects a light emitted from an object (such as a pen) having anexternal light source such as a light emitting diode (LED), a light inthe form of which a light emitted from a back light is reflected by afinger or a pen touching a screen to return, or the like. The applicantof this application proposes a method of driving a light receivingcircuit when detecting the light in the form of which a light emittedfrom a back light is reflected by a finger or a pen touching a screen toreturn in Japanese Patent Laid-open No. 2006-127212.

Each of Japanese Patent Laid-open Nos. 2000-19478 and 2006-127212relates to a technique about a liquid crystal display device of a typein which the display circuit controls a liquid crystal. However, adisplay device which displays thereon an image and receives a light byusing organic electro luminescence elements as self-light emittingelements is also known. This display device, for example, is describedin Japanese Patent Laid-open Nos. 2004-127272 and 2005-293374.

In the liquid crystal display device having the display circuit and thelight receiving circuits disposed on the same substrate, a lighttransmittance decreases because no light emitted from the back lightpenetrates through a region having the light receiving circuit disposedtherein. Therefore, it is recommended that when a light receivingresolution at a high level is unnecessary for the display device, thenumber of light receiving circuits disposed on the substrate is reducedas much as possible, thereby making a light receiving resolution lowerin level than a display resolution. With regard to the case where thelight receiving resolution at the high level is unnecessary for thedisplay device, for example, there is the case where an interface isspecialized by using a touch sensor. In the interface using the touchsensor, it has to be determined whether or not a touch (depression) ismade, or whether a movement is made in a touch state. Thus, the lightreceiving resolution at the high level is unnecessary for the displaydevice. In addition, a size of the finger or pen touching the screen ofa display panel is much larger than that of one pixel. Hence, it is alsounnecessary to dispose light receiving sensors in all the pixels.

However, when the number of light receiving circuits is reduced, a userwho sees an image displayed on the screen may feel a sense ofincompatibility. For this reason, a problem may be caused in the displayquality.

SUMMARY

The present application has been made in the light of suchcircumstances, and it is therefore desirable to provide a display deviceand an information processing apparatus using the same which is capableof maintaining a display quality even when a light receiving resolutionis made lower in level than a display resolution.

According to an embodiment, a display device includes at least a displaycircuit for displaying an image, and a light receiving sensor fordetecting a light disposed therein. When a light receiving circuitregion including the light receiving sensor is made a dark portion, anda region other than the light receiving circuit region is made a lightportion, the display circuit and the light receiving sensor are disposedso that a spatial frequency of a repetitive pattern of the lightportions and the dark portions becomes equal to or higher than 10 cpd.

In the display device according to the embodiment, when the lightreceiving circuit region including the light receiving sensor is madethe dark portion, and the region other than the light receiving circuitregion is made the light portion, the display circuit and the lightreceiving sensor are disposed so that the spatial frequency of therepetitive pattern of the light portions and the dark portions becomesequal to or higher than 10 cpd.

According to another embodiment, an information processing apparatusincludes display light receiving means having at least a display circuitfor displaying an image, and a light receiving sensor for detecting alight disposed thereon, the display light receiving means serving todisplay predetermined information in a form of an image and serving todetect a light through the light receiving sensor; input informationanalyzing means for analyzing externally inputted information such asinformation inputted by a user by using a light receiving imagegenerated from a light receiving signal outputted from the lightreceiving sensor; and control means for executing predetermined controlprocessing in accordance with a message supplied thereto from the inputinformation analyzing means, in which when a light receiving circuitregion including the light receiving sensor is made a dark portion, anda region other than the light receiving circuit region is made a lightportion in the display light receiving means, the display circuit andthe light receiving sensor are disposed so that a spatial frequency of arepetitive pattern of the light portions and the dark portions becomesequal to or higher than 10 cpd.

In the information processing apparatus according to the anotherembodiment, at least the display circuit for displaying thereon animage, and the light receiving sensor for detecting a light aredisposed, the predetermined information is displayed in the form of theimage, and the light receiving sensor detects the light. Also, the inputinformation inputted by the user is analyzed by using the lightreceiving image generated from the light receiving signal outputted fromthe light receiving sensor, and the predetermined control processing isexecuted in accordance with the message supplied as a result of theanalysis. Also, when the light receiving circuit region including thelight receiving sensor is made the dark portion, and the region otherthan the light receiving circuit region is made the light portion in thedisplay light receiving means of the information processing apparatus,the display circuit and the light receiving sensor are disposed so thatthe spatial frequency of the repetitive pattern of the light portionsand the dark portions becomes equal to or higher than 10 cpd.

According to still another embodiment, there is provided a displaydevice including a display circuit for displaying an image, and at leasta light receiving sensor for detecting a light disposed therein, inwhich when a display region including the display circuit is made alight portion, and a portion other than the display region is made adark portion, the display circuit and the dark portion are disposed sothat a spatial frequency of a repetitive pattern of the light portionsand the dark portions becomes equal to or higher than 10 cpd, and atleast a part of the dark portion is a light receiving circuit regionincluding the light receiving sensor.

According to yet another embodiment, an information processing apparatusincludes display light receiving means having at least a display circuitfor displaying an image, and a light receiving sensor for detecting alight disposed thereon, the display light receiving means serving todisplay predetermined information in a form of an image and serving todetect a light through the light receiving sensor; input informationanalyzing means for analyzing externally inputted information such asinformation inputted by a user by using a light receiving imagegenerated from a light receiving signal outputted from the lightreceiving sensor; and control means for executing predetermined controlprocessing in accordance with a message supplied thereto from the inputinformation analyzing means, in which when a light receiving circuitregion including the light receiving sensor is made a dark portion, anda region other than the light receiving circuit region is made a lightportion in the display light receiving means, the display circuit andthe light receiving sensor are disposed so that a spatial frequency of arepetitive pattern of the light portions and the dark portions becomesequal to or higher than 10 cpd, and at least a part of the dark portionis a light receiving circuit region including the light receivingsensor.

According to an embodiment, even when the light receiving resolution ismade lower in level than the display resolution, the display quality canbe maintained.

Additional features and advantages are described herein, and will beapparent from, the following Detailed Description and the figures.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a diagram showing an example of a configuration of aninformation processing apparatus according to an embodiment;

FIG. 2 is a diagram showing an example of a structure of a basic unitwhen a light receiving resolution is identical in level to a displayresolution;

FIG. 3 is a circuit diagram showing circuit examples of a displaycircuit and a light receiving circuit shown in FIG. 2;

FIG. 4 is a circuit diagram showing circuit examples of the displaycircuit and the light receiving circuit when a display panel isconstituted by an EL display;

FIG. 5 is a diagram showing a display state of the basic unit shown inFIG. 2;

FIG. 6 is a diagram when the display state of the basic unit shown inFIG. 5 is viewed from the entire display;

FIG. 7 is a diagram showing a state of FIG. 6 viewed from a user;

FIG. 8 is a diagram explaining a sensor pitch and a display pixel pitchin a dispersion of the basic unit shown in FIG. 2;

FIG. 9 is a diagram showing a structural example and a display state ofthe basic unit when the light receiving resolution is half the displayresolution;

FIG. 10 is a diagram showing a display state of the basic unit shown inFIG. 9;

FIG. 11 is a diagram showing a state of FIG. 10 viewed from the user;

FIG. 12 is a diagram showing a structural example and a display state ofthe basic unit when the light receiving resolution is third the displayresolution;

FIG. 13 is a diagram showing a display state of the basic unit shown inFIG. 12;

FIG. 14 is a diagram showing a display state of FIG. 13 viewed from theuser;

FIG. 15 is a diagram explaining the sensor pitch and the display pixelpitch when the light receiving resolution is made lower in level thanthe display resolution;

FIG. 16 is a graph showing a correlation between a spatial frequency anda contrast sensitivity;

FIG. 17 is a view explaining the spatial frequency;

FIG. 18 is a diagram explaining the spatial frequency;

FIG. 19 is a waveform chart explaining Michelson contrast;

FIG. 20 is a diagram explaining a width W of a pixel in a display panelhaving no light receiving function;

FIG. 21 is a diagram explaining an example of a disposition when a lightreceiving circuit region is disposed so as for its width to fall withinthe width W of the pixel;

FIGS. 22A and 22B are respectively diagrams each explaining a programcaused when the disposition shown in FIG. 21 is adopted;

FIG. 23 is a diagram explaining a width Y′ of the pixel adopted in thedisplay panel shown in FIG. 1;

FIG. 24 is a diagram showing an example in which the pixel is composedof R, G, B, and W;

FIG. 25 is a diagram showing a structural example of a basic unit whenthe light receiving resolution is made identical in level to the displayresolution by using the pixel shown in FIG. 24;

FIG. 26 is a diagram showing a structural example of a basic unit whenthe light receiving resolution is made half the display resolution byusing the pixel shown in FIG. 24;

FIG. 27 is a diagram showing a structural example of the basic unit inwhich a light receiving sensor is provided in a dark portion region, anda dummy black portion having no light receiving sensor is provided inanother dark region;

FIG. 28 is a diagram showing a structural example of the basic unit inwhich a light receiving sensor is provided in a dark portion region, anda dummy black portion having no light receiving sensor is provided inanother dark region;

FIG. 29 is a diagram showing a structural example of the basic unit inwhich a light receiving sensor is provided in a dark portion region, anda dummy black portion having no light receiving sensor is provided inanother dark region;

FIG. 30 is a diagram showing a structural example of the basic unit inwhich a pitch of light receiving sensors changes;

FIG. 31 is a diagram showing a structural example of the basic unit inwhich a light receiving sensor is provided in a dark portion region, anda dummy black portion having no light receiving sensor is provided inanother dark region;

FIG. 32 is a plan view showing a structure of a module in a displaydevice according a change of an embodiment;

FIG. 33 is a perspective view showing a television receiver includingthe display device according to the embodiment;

FIG. 34 is a perspective view showing a digital still camera includingthe display device according to an embodiment;

FIG. 35 is a perspective view showing a note type personal computerincluding the display device according to an embodiment;

FIG. 36 is a schematic view showing a portable terminal apparatusincluding the display device according to an embodiment; and

FIG. 37 is a perspective view showing a video camera including thedisplay device according to an embodiment.

DETAILED DESCRIPTION

The present application will be described in greater detail belowaccording to an embodiment with reference to the accompanying drawings.

A display device according to an embodiment is one (for example, adisplay panel 25 shown in FIG. 1) having at least a display circuit (forexample, a display circuit 41 shown in FIG. 2) for displaying an image,and a light receiving sensor (for example, a light receiving sensor SSRshown in FIG. 3) for detecting a light disposed therein, in which when aregion (for example, a light receiving circuit region 71 shown in FIG.9) of the light receiving sensor is made a dark portion, and a region(for example, a pixel Pix region shown in FIG. 9) other than the lightreceiving sensor is made a light portion, the display circuit and thelight receiving sensor are disposed so that a spatial frequency of arepetitive pattern of the light portions and the dark portions becomesequal to or higher than 10 cpd.

An information processing apparatus (for example, an informationprocessing apparatus 1 shown in FIG. 1) according to another embodimentincludes: display light receiving means (for example, a display panel 25shown in FIG. 1) having at least a display circuit for displaying animage, and a light receiving sensor for detecting a light disposedtherein, the display light receiving means serving to displaypredetermined information in the form of an image and serving to detecta light through the light receiving sensor; input information analyzingmeans (for example, an input information analyzing portion 27 shown inFIG. 1) for analyzing input information inputted by a user by using alight receiving image generated from a light receiving signal outputtedfrom the light receiving sensor; and control means (for example, acontrol portion 11 shown in FIG. 1) for executing predetermined controlprocessing in accordance with a message supplied thereto from the inputinformation analyzing means. When a light receiving circuit regionincluding the light receiving sensor is made a dark region, and a regionother than the light receiving circuit region is made a light portion inthe display light receiving means, the display circuit and the lightreceiving sensor are disposed so that a spatial frequency of arepetitive pattern of the light portions and the dark portions becomesequal to or higher than 10 cpd.

FIG. 1 shows a structural example of an information processing apparatusaccording to an embodiment.

The information processing apparatus 1 shown in FIG. 1 is a mobilephone, a digital camera, a personal digital assistant (PDA) or the like.Here, the information processing apparatus 1 includes at least a displaydevice for displaying thereon predetermined information in the form ofan image, and executes predetermined information processing such as callprocessing, image capturing processing, and processing fortransmitting/receiving data. With this information processing apparatus1, predetermined information can be inputted by making the pointing on ascreen of the display device by a finger, a pen, or the like.

The information processing apparatus 1 is composed of a control portion11, a read only memory (ROM) 12, a communication portion 13, a displayprocessing portion 14, and the like. The display processing portion 14corresponds to the display device described above. Also, the displayprocessing portion 14 is composed of an image signal generating portion21, a controller 22, a gate driver 23, a source driver 24, a displaypanel 25, a light receiving signal processing portion 26, an inputinformation analyzing portion 27, and a memory portion 28.

The control portion 11 controls an entire operation of the informationprocessing apparatus 1 in accordance with a control program stored inthe ROM 12. For example, the control portion 11 supplies display data tothe image signal generating portion 21 in accordance with an instructionissued from another module (not shown) or data received by thecommunication portion 13. Here, the display data is intended to bedisplayed on the display panel 25. In addition, the control portion 11,as will be described later, also updates the display data which issupplied to the image signal generating portion 21, and supplies data tothe communication portion 13 or another module in accordance with amessage supplied from the input information analyzing portion 27.

Here, another module, for example, is a module or the like for carryingout a call function when the information processing apparatus 1 is amobile phone. Alternatively, another module is a module or the like forcarrying out an image capturing function when the information processingapparatus 1 is a digital still camera. The communication portion 13communicates with any of various kinds of apparatuses in a wired orwireless manner through a network such as the Internet, and supplies theacquired data to the control portion 11. It is noted that when it isunnecessary for the information processing apparatus 1 to communicatewith the outside, the communication portion 13 can be omitted.

The image signal generating portion 21 generates an image signal aboutan image corresponding to the display data supplied thereto from thecontrol portion 11. Also, the image signal generating portion 21 outputsthe image signal thus generated to the controller 22 for controlling thedriving for the display panel 25.

The controller 22 controls the driving for the gate driver 23, and thedriving for the source driver 24. Here, the gate driver 23 controls ON(conduction) or OFF (non-conduction) of a switching element which isdisposed in each of picture elements in the display panel 25. Also, thesource driver 24 supplies a voltage signal (hereinafter referred to as“a display signal”) corresponding to the image signal to each of thepicture elements in conjunction with the driving for the gate driver 23.

The display panel 25, for example, is constituted by a liquid crystaldisplay (LCD) in which the picture elements of m×n are disposed inmatrix. Here, the picture elements of m×n mean that the m pictureelements are disposed in a horizontal direction, and the n pictureelements are disposed in a vertical direction. In addition, the displaypanel 25 displays thereon predetermined information in the form of animage by changing a transmittance of a light emitted from a back light(not shown) in a liquid crystal layer. Also, the display panel 25 has alight receiving sensor built therein. Thus, the light receiving sensorreceives a return light in the form of which the light emitted from theback light is reflected by a finger, a pen or the like contacting orbeing close to a surface of an uppermost portion of the display panel 25to turn. Also, the light receiving sensor supplies the resulting lightreceiving signal to the light receiving signal processing portion 26.For this reason, a display circuit for displaying an image, and a lightreceiving circuit for detecting a light as input information areprovided in the display panel 25.

It is noted that one picture element as a unit (a display unit of animage) of the display resolution is composed of three picture elementsof R(Red), G(Green), and B(Blue). Hence, the total number of pictureelements constituting the display panel 25 strictly becomes (3 m×n).Hereinafter, the picture element as the unit, of the display resolution,composed of the three picture elements of R, G, and B is referred to as“a pixel”, and each of the picture elements of R, G, and B constitutingthe pixel is referred to as “a sub pixel”.

The light receiving signal processing portion 26 executes predeterminedamplifying processing, filtering processing, image processing, or thelike for the light receiving signal supplied from the display panel 25.Also, the light receiving signal processing portion 26 supplies theshaped light receiving signal after execution of such processing to theinput information analyzing portion 27.

The input information analyzing portion 27 analyzes a position (contactposition) on the screen pointed by the finger, the pen, or the like byusing the light receiving image generated from the light receivingsignal, thereby analyzing information inputted by the user. Also, theinput information analyzing portion 27 supplies the analysis result inthe form of a message to the control portion 11. For example, it isassumed that the light receiving signal processing portion 26 suppliesthe light receiving signal of an N-th frame to the input informationanalyzing portion 27. In this case, the input information analyzingportion 27 compares the light receiving image generated from the lightreceiving signal of the N-th frame with the light receiving image of aprevious frame ((N−1)-th frame) stored in the memory portion 28, andcalculates a difference between both the light receiving images. Also,the input information analyzing portion 27 analyzes a motion of thecontact position from the previous frame based on the difference thuscalculated. When there are a plurality of contact positions, the inputinformation analyzing portion 27 analyzes each of the plurality ofcontact positions. Moreover, the input information analyzing portion 27compares the current information with information, stored in the memoryportion 28, on a change in each of contact positions from before apredetermined time period. As a result, the input information analyzingportion 27 determines the message, about the detection of the contactposition, which is intended to be supplied to the control portion 11.

In the display panel 25 of the information processing apparatus 1configured in the manner as described above, one light receiving circuitis disposed every disposition of the N pixels in the horizontaldirection. As apparent from this, the light receiving resolution islower in level than the display resolution.

Hereinafter, a description will be firstly given with respect to thecase where the light receiving resolution is identical in level to thedisplay resolution, that is, the case where the pixels and the lightreceiving circuits are disposed so as to show one-to-one correspondence.Next, a description will be given with respect to the case, adopted inthe display panel 25, where the light receiving resolution is lower inlevel than the display resolution in comparison with the above case.

FIG. 2 shows a structural example of a basic unit of a pixel dispositionwhen the light receiving resolution is identical in level to the displayresolution.

When the light receiving resolution is identical in level to the displayresolution, the structure is made such that the basic unit 31 shown inFIG. 2 is repetitively disposed in a horizontal direction in the entiredisplay.

The basic unit 31 is structured such that the pixel Pix, and the lightreceiving circuit region 71 having the light receiving circuit 42disposed therein are disposed in the horizontal direction. The pixel Pixis composed of sub pixels SubPix of R, G, and B each having the displaycircuit 41. The display circuits 41, and the light receiving circuit 42are formed on the same substrate (glass substrate).

Display signal lines 51 are connected to the display circuits 41 of thesub pixels SubPix of R, G, and B, respectively. The source driver 24supplies the display signal to the display circuits 41 through thedisplay signal lines 51, respectively. In addition, the display circuits41 of the sub pixels SubPix of R, G, and B are also connected to thesame display selection line 52 extending in the horizontal direction. Adisplay selection signal outputted from the gate driver 23 is suppliedto the display circuits of the sub pixels SubPix of R, G, and B throughthe display selection line 52. Each of the display circuits 41 controlsa light emitted from the back light in accordance with the displayselection signal and the display signal.

On the other hand, the light receiving circuit 42 controls lightreception made by a light receiving sensor SSR (refer to FIG. 3). Thus,the light receiving circuit 42 supplies the light receiving signal whichthe light receiving sensor SSR receives the light to generate to thelight receiving signal processing portion 26 through the light receivingsignal line 53 wired in the vertical direction within a light receivingcircuit region 71.

FIG. 3 shows circuit examples of the display circuit 41 and the lightreceiving circuit 42.

The display circuit 41 is composed of a switching element SW1, a liquidcrystal layer LC, a holding capacitor C, and the like. The switchingelement SW1, for example, is constituted by a thin film transistor(TFT).

In the display circuit 41, the switching element SW1 is turned ON or OFFfor connection in accordance with the display selection signal suppliedthereto from the gate driver 23 through the display selection line 52.While the switching element SW1 is held in an ON state, the displaysignal supplied from the source driver 24 is supplied to each of theliquid crystal layer LC and the holding capacitor C through the displaysignal line 51. As a result, a predetermined voltage is applied to eachof the liquid crystal layer LC and the holding capacitor C. In theliquid crystal layer LC, the arrangement of the liquid crystal moleculeschanges in accordance with the applied voltage, so that the lightemitted from the back light is emitted to the front side of the displaypanel 25. On the other hand, while the switching element SW1 is held inan OFF state, the voltage applied to each of the liquid crystal layer LCand the holding capacitor C is held therein. Turn-ON and turn-OFF of theswitching element SW1 are sequentially switched in the verticaldirection one horizontal line by one horizontal line with the sub pixelsSubPix disposed horizontally in a row as the horizontal line, that is,the scanning is performed in a line-sequential manner, therebydisplaying an image on the entire display panel 25.

The light receiving circuit 42 is composed of switching elements SW2 andSW3, a sensor SSR, and an amplifier AMP. Each of the switching elementsSW2 and SW3, for example, is constituted by a TFT. Also, the sensor SSR,for example, is constituted by a photodiode, a TFT or the like.

The sensor SSR receives a light made incident thereto through a surfaceof the display panel 25, and outputs a current signal corresponding to aquantity of received light to the amplifier AMP. The amplifier AMPconverts the current signal inputted thereto into a voltage signal,amplifies the resulting voltage signal, and outputs the amplifiedvoltage signal in the form of a light receiving signal. The switchingelement SW3 is turned ON or OFF for connection in accordance with aread-out control signal. While the switching element SW3 is held in anON state, the light receiving signal outputted from the amplifier AMP issupplied to the light receiving signal processing portion 26 through alight receiving signal line 53. The switching element SW2 is turned ONor OFF for connection in accordance with a reset control signal. Whilethe switching element SW2 is held in an ON state, the light receivingsignal is reset.

The display circuit 41 and the light receiving circuit 42 configured inthe manner as described above are disposed in the sub pixel SubPix andthe light receiving circuit region 71 of FIG. 2, respectively.

It is noted that the display panel 25 can also be realized in the formof an EL display using an organic or inorganic EL elements as self-lightemitting elements instead of being adopted in the form of the LCD.

FIG. 4 shows circuit examples of the display circuit 41 and the lightreceiving circuit 42 when the display panel 25 is structured in the formof the EL display. It is noted that since the light receiving circuit 42has the same structure as that of the light receiving circuit 42 shownin FIG. 3, its description is omitted here for the sake of simplicity.

The display circuit 41 is composed of switching elements SW1 and SW4, acircuit group 61, and an EL element 62.

The circuit group 61, for example, is composed of a display data writingcircuit, a threshold dispersion correcting circuit, and the like. Thedisplay data writing circuit is a current/voltage (I/V) convertingcircuit for converting the display signal (voltage signal) suppliedthereto through the switching element SW1 into a current signal. Also,the threshold dispersion correcting circuit is a circuit (a circuit forcorrecting a threshold of a TFT) for correcting a dispersion of thedisplay signal due to the switching element SW1.

The switching element SW1 is turned ON or OFF for connection inaccordance with the display selection signal supplied thereto from thegate driver 23 through the display selection line 52. While theswitching element SW1 is held in an ON state, the display signalsupplied from the source driver 24 is supplied to the circuit group 61through the display signal line 51. The circuit group 61 executes theprocessing such as the I/V correction and dispersion correctiondescribed above for the display signal inputted thereto, and outputs thedisplay signal obtained after execution of the processing to theswitching element SW4. The switching element SW4 is turned ON or OFF forconnection in accordance with a light emission control signal. While theswitching element SW4 is held in an ON state, the display signal sentfrom the circuit group 61 is supplied to the EL element 62. As a result,the EL element 62 emits a light.

It is noted that the read-out control signal, the reset signal, and thelight emission control signal which have been described with referenceto FIGS. 3 and 4 are supplied from the gate driver 23 or the sourcedriver 24 through a control line (not shown).

FIG. 5 shows a display state of the basic unit 31 shown in FIG. 2.

As has been described with reference to FIG. 3, when the display circuit41 causes the liquid crystal layer LC to transmit the light emitted fromthe back light by controlling the liquid crystal layer LC, as shown inFIG. 5, the sub pixels SubPix of R, G, and B display a red color (R), agreen color (G), and a blue color (B), respectively. On the other hand,the light receiving circuit region 71 is a region which does nottransmit the light emitted from the back light. As a result, a userrecognizes the light receiving circuit region 71 as a black color (K).

In FIG. 5, a color difference among R, G, and B are shown in the form ofa contrast density of half-tone dot meshing. That is to say, the redcolor corresponding to the sub pixel SubPix of R is shown in the form ofthe half-tone dot meshing having a high density, and the green colorcorresponding to the sub pixel SubPix of G is shown in the form of thehalf-tone dot meshing having a middle density. Also, the blue colorcorresponding to the sub pixel SubPix of B is shown in the form of thehalf-tone dot meshing having a low density. This is also applied to eachof other figures which will be described later.

Hereinafter, the sub pixels SubPix of R, G, and B are also referred toas an R sub pixel, a G sub pixel, and a B sub pixel, respectively.

When the display state of the basic unit 31 shown in FIG. 5 is viewed interms of the entire display, it is as shown in FIG. 6. That is to say,since the basic unit 31 is repetitively disposed in the horizontaldirection, the entire display becomes a stripe of the red color (R), thegreen color (G), the blue color (B), and the black color (K).

However, the stripe of the red color, the green color, and the bluecolor shown in FIG. 6 is viewed as a white color due to the mixing ofthe red color, the green color, and the blue color. As a result, thestripe, as shown in FIG. 7, seems to display a repetitive pattern of thewhite color and the black color from eyes of the user. It is noted thata duty ratio between the white color and the black color is no object.

An interval of black color lines in the repetitive pattern of the whitecolor and the black color, as shown in FIG. 8, is a distance betweeneach two light receiving circuit regions 71, and is set as a sensorpitch α. The sensor pitch α is also equal to a display pixel pitch β asan interval of the pixels Pix. Therefore, when the light receivingresolution is identical in level to the display resolution, arelationship of the sensor pitch α=the display pixel pitch β isestablished.

FIG. 9 shows a structural example and a display state of the basic unitwhen the light receiving resolution is half the display resolution.

When the light receiving resolution is half the display resolution, inthe entire display, the basic unit 81 shown in FIG. 9 is repetitivelydisposed in the horizontal direction. Thus, the basic unit 81 iscomposed of two pixels Pix and one light receiving circuit region 71.

Also, the R sub pixel, the G sub pixel, and the B sub pixel of the basicunit 81 display the red color (R), the green color (G), and the bluecolor (B), respectively, and the light receiving circuit region 71 isrecognized as the black color (K) by the user. Hence, when the displaystate of the basic unit 81 is viewed in terms of the entire display, itis as shown in FIG. 10.

The stripe of the red color (R), the green color (G), the blue color(B), and the black (K) shown in FIG. 10 seems to be the repetitivepattern of the white color (light portion) and the black color (darkportion) as shown in FIG. 11 from the eyes of the user. As apparent fromcomparison of this case with the case of FIG. 7, the interval of theblack color line at this time becomes larger than that when the lightreceiving resolution is identical in level to the display resolution asshown in FIG. 7. As a result, an area of the black color portions in theentire display becomes smaller than that shown in FIG. 7.

FIG. 12 shows a structural example and a display state of the basic unitwhen the light receiving resolution is third the display resolution.

When the light receiving resolution is third the display resolution, inthe entire display, the basic unit 101 shown in FIG. 12 is repetitivelydisposed in the horizontal direction. Thus, the basic unit 101 iscomposed of three pixels Pix and one light receiving circuit region 71.

Also, the R sub pixel, the G sub pixel, and the B sub pixel of the basicunit 101 display the red color (R), the green color (G), and the bluecolor (B), respectively, and the light receiving circuit region 71 isrecognized as the black color (K) by the user. Hence, when the displaystate of the basic unit 101 is viewed in terms of the entire display, itis as shown in FIG. 13.

The stripe of the red color (R), the green color (G), the blue color(B), and the black color (K) of FIG. 13 seems to be the repetitivepattern of the white color and the black color as shown in FIG. 14 fromthe eyes of the user. The interval of the black color lines at this timebecomes further larger than that in each of the case where the lightreceiving resolution is identical in level to the display resolution asshown in FIG. 7, and the case where the light receiving resolution ishalf the display resolution as shown in FIG. 11. As a result, the areaof the black color portions in the entire display becomes furthersmaller than that in each of the case shown in FIG. 7 and the case shownin FIG. 11.

As described above, when the light receiving resolution is reduced so asto be half, third, . . . the display resolution, as shown in FIG. 15,the sensor pitch α becomes larger than the display pixel pitch β(α>β),and a difference (α−β) between the sensor pitch α and the display pixelpitch β becomes gradually large. Note that, the display pixel pitch βwhen the light receiving resolution is made lower than the displayresolution is set as one having the shorter distance of the interval atwhich the light receiving circuit region 71 is sandwiched between thepixels Pix, and the interval at which no light receiving circuit region71 is sandwiched between the pixels Pix.

When the sensor pitch α becomes gradually larger, the region displayedwith the black color becomes less in terms of the entire display. As aresult, the light transmittance increases and the optical specificationis enhanced.

However, when the interval of the black color lines obtained byarranging the light receiving circuit regions 71 in the verticaldirection becomes larger than a predetermined interval, that is, whenthe sensor pitch α becomes larger than the predetermined interval, theblack color line is recognized as a streak based on the visual sensespatial processing characteristics of a human being. Thus, even thoughthe optical specification is enhanced, the sensor pitch α may not be setas being endlessly large.

Then, a description will now be given with respect to the optimal sensorpitch α based on the visual sense spatial processing characteristics ofthe human being when the light receiving resolution is made lower inlevel than the display resolution with reference to FIGS. 16 to 19.

FIG. 16 shows a correlation between the spatial frequency and thecontrast sensitivity, plotted for various average retinal illuminancesas a parameter. The details of the correlation between the spatialfrequency and the contrast sensitivity are described in “VisionInformation Processing Handbook (first edition)” edited and written byThe Vision Society of Japan, Asakura Publishing Co., Ltd., p. 194, FIG.5.4.

In a graph shown in FIG. 16, an axis of abscissa represents the spatialfrequency, and an axis of ordinate represents the contrast sensitivity.Here, each of the axis of abscissa and the axis of ordinate is alogarithmic axis.

The spatial frequency represented by the axis of abscissa in FIG. 16, asshown in FIG. 17, means a change in contrast density (contrast), of thewhite color and the black color, which falls within the visual angle of1° (degree) of the human being. The unit of the spatial frequency is cpd(cycle per degree).

Next, when it is assumed that the display panel 25 is at a distance Lfrom each of the eyes of the human being, the visual angle of 1° of thehuman being corresponds to a width D, calculated from (the distanceL×tan(1)), on the screen of the display panel 25. Therefore, in otherwords, the spatial frequency means how many changes in contrast densityof the white color and the black color are contained in the width D ofthe display panel 25.

A state in which the spatial frequency is low, as shown in the left-handside of FIG. 18, is one in which the number of changes in contrastdensity of the white color and the black color is small. On the otherhand, a state in which the spatial frequency is high, as shown in theright-hand side of FIG. 18, is one in which the number of changes incontrast density of the white color and the black color is large. It isnoted that although the change in contrast density of the white colorand the black color is shown in the form of a repetition of a binary ofthe white color and the black color in FIG. 18, actually, a luminancewhen the color change is made from the black color to the white color,or from the white color to the black color changes gently as representedby a sine wave curve as shown in FIG. 19.

On the other hand, the contrast sensitivity represented by the axis ofordinate of FIG. 16 means a reciprocal number of a contrast threshold.Thus, a relationship of contrast sensitivity=(1/contrast threshold) isestablished. Here, the contrast threshold means a minimum contrast atwhich a visual stimulus (the luminance due to a change in contrastdensity of the white color and the black color) can be recognized by thehuman being.

The Michelson contrast as a ratio with respect to an average luminanceL0 of an amplitude of a sine wave, for example, is adopted as thecontrast when the contrast threshold is measured. When a maximumluminance and a minimum luminance of the sine wave, as shown in FIG. 19,are Lmax and Lmin, respectively, the Michelson contrast can be obtainedfrom the following expression (1):Michelson contrast=(Lmax−Lmin)/(Lmax+Lmin)  (1)

In the correlation between the spatial frequency and the contrastsensitivity obtained in the manner as described above, as shown in FIG.16, the contrast sensitivity gradually increases as the spatialfrequency decreases. Thus, the correlation of FIG. 16 represents thateven the object having the small luminance change can be visualized asthe spatial frequency further decreases.

This represents that when the spatial frequency becomes equal to orlower than the predetermined value, that is, when the sensor pitch αbecomes equal to or larger than the predetermined interval, the blackcolor line due to the light receiving circuit region 71 is recognized asthe streak on the display panel 25 by the user.

Then, when the light receiving resolution is made lower in level thanthe display resolution in the display panel 25 of the informationprocessing apparatus 1, in other words, when the light receiving circuitregions 71 are discretely reduced and disposed such that one lightreceiving circuit region 71 is disposed every N pixels Pix, the sensorpitch α is set which becomes the value of the spatial frequency at whichno black color line is recognized as the streak.

More specifically, as long as the spatial frequency is equal to orhigher than 10 cpd and equal to or lower than 18 cpd, the imagedisplayed on the display panel 25 can be visualized without feeling asense of incompatibility. Moreover, the spatial frequency is equal to orhigher than 18 cpd, the image can be visualized similarly to the casewhere the light receiving resolution is identical in level to thedisplay resolution. For example, in the case where it is supposed thatthe information processing apparatus 1 is the mobile phone, the PDA, orthe like, and the distance L from each of the eyes of the user of theinformation processing apparatus 1 to the display panel 25 is about 20cm, the sensor pitch α when the spatial frequency is 10 cpd correspondsto 350 μm, and the sensor pitch α when the spatial frequency is 18 cpdcorresponds to 195 μm.

Therefore, in the information processing apparatus 1 as the mobilephone, the PDA, or the like, the light receiving circuit regions 71 aredisposed so that the sensor pitch α becomes equal to or smaller than 350μm in the horizontal direction of the display panel 25. As a result,even when the light receiving resolution is made lower in level than thedisplay resolution, the display quality can be maintained. Note that,when the sensor pitch α is set as being equal to or larger than 195 μm,the light receiving circuit regions 71 are disposed such that importanceis attached to the light transmittance rather than the light receivingresolution.

Note that, when the information processing apparatus 1 is the televisionreceiver or the like, the distance L at which the user visualizes thedisplay panel 25 is different from that of the above case. Hence, thesensor pitch α at which the spatial frequency becomes equal to or higherthan 10 cpd is also different from that of the above case. Therefore,the sensor pitch α in the display panel 25 is determined incorrespondence to the most general distance L at which the uservisualizes the display panel 25 of the information processing apparatus1. However, when the spatial frequency becomes equal to or higher than10 cpd and equal to or lower than 18 cpd, even if the light receivingresolution is made lower in level than the display resolution, thedisplay quality can be maintained.

Next, a description will now be given with respect to the setting of awidth of the R sub pixel, the G sub pixel, and the B sub pixel, and awidth of the light receiving circuit region 71 when the light receivingresolution is made lower in level than the display resolution.

When as shown in FIG. 20, the width of one pixel Pix in the displaypanel (not shown) having no light receiving function is W, the width Yof the R sub pixel, the G sub pixel, and the B sub pixel of the pixelPix having the light receiving circuit region 71 disposed therein isshortened as shown in FIG. 21, so that the sum of the width Y of thepixel Pix and the width X of the light receiving circuit region 71becomes W. In this case, the stricture is simple because no change isnecessary for any of other pixels Pix each having no light receivingcircuit region 71 disposed therein.

However, when the pixel Pix and the light receiving circuit region 71are provided so as for the total width thereof to fall within the widthW of one pixel Pix in such a manner, the following problem is caused.

That is to say, when the pixel Pix on the left-hand side of the lightreceiving circuit region 71 displays the black color in FIG. 21, theline width which is felt as the black color by the user, including theblack color of the light receiving circuit region 71, becomes the sum ofthe width Y of the pixel Pix and the width X of the light receivingcircuit region 71, that is, the width W.

On the other hand, when the pixel Pix on the right-hand side of thelight receiving circuit region 71 displays the black color as shown inFIG. 21, the line width which is felt as the black color by the user,including the black color of the light receiving circuit region 71,becomes the sum of the width W of the pixel Pix displaying the blackcolor, and the width X of the light receiving circuit region 71, thatis, the width (X+W).

Therefore, as shown in FIGS. 22A and 22B, even when the same one pixelPix displays the black color, there are the case where the black coloris displayed in the width W (refer to FIG. 22A) and the case where theblack color is displayed in the width (X+W) (refer to FIG. 22B).

The phenomenon that the color is displayed in different widths in spiteof the same one pixel Pix causes the user to feel the sense ofincompatibility, especially, when a character or a figure, such as anumeral such as “1”, or a ruled line, adopted to be represented by onepixel is displayed with one pixel.

Then, in the display panel 25 of the information processing apparatus 1,when the light receiving circuit regions 71 are discretely reduced sothat one light receiving circuit region 71 is disposed every N pixelsPix, and thus the horizontal light receiving resolution is reduced inlevel to 1/N of the display resolution, a width Y′ of the entire pixelPix is set so as to meet a relationship of (N×W)=(N×Y′+X).

For example, when the light receiving circuit regions 71 are discretelyreduced so that one light receiving circuit region 71 is horizontallydisposed every two pixels Pix, and thus the horizontal light receivingresolution is reduced in level to 1/N of the display resolution, asshown in FIG. 23, the width Y′ of the entire pixel Pix is set so as tomeet a relationship of (2×W)=(2×Y′+X).

As a result, even when which pixel Pix displays the black color, theuser is prevented from feeling the sense of incompatibility. That is tosay, even when the light receiving resolution is made lower in levelthan the display resolution, the display quality can be maintained.

As described above, in the display panel 25 of the informationprocessing apparatus 1, when the region of the pixel Pix is made thelight portion, and the light receiving circuit region 71 having thelight receiving circuit 41 disposed therein is made the dark portion,the light receiving circuit regions 71 are discretely reduced anddisposed for the disposition of the pixels Pix so that the spatialfrequency of the repetitive pattern of the light portions and the darkportions becomes equal to or higher than 10 cpd (and equal to or lowerthan 18 cpd). As a result, since the black color line formed byarranging the light receiving circuit regions 71 in the verticaldirection is prevented from being recognized as the streak by the user,the display quality can be maintained. That is to say, even when thelight receiving resolution is made lower in level than the displayresolution, the display quality can be maintained.

When the light receiving circuit regions 71 are discretely reduced sothat one light receiving circuit region 71 is horizontally disposedevery N pixels Pix, and thus the horizontal light receiving resolutionis reduced in level to 1/N of the display resolution, the width Y′ ofthe entire pixel Pix in the display panel 25 is set so as to meet therelationship of (N×W)=(N×Y′+X) for the width W of the pixel Pix when thedisplay panel 25 has no light receiving circuit region 71 disposedtherein. As a result, since even when any pixels display the line or thecharacter, the line or the character can be displayed so as to have thesame line width, the display quality can be maintained. That is to say,even when the light receiving resolution is made lower in level than thedisplay resolution, the display quality can be maintained.

It is noted that although in the embodiment described above, the lightreceiving circuit regions 71 are disposed horizontally in a row withrespect to the pixels Pix, the light receiving circuit regions 71 mayalso be disposed vertically in a row. In this case, the light receivingcircuit regions 71 are discretely reduced and disposed in the verticaldirection so that the spatial frequency of the repetitive pattern of thelight portions and the dark portions becomes equal to or higher than 10cpd (and equal to or lower than 18 cpd).

In addition, the description has been given with respect to theembodiment in which the light receiving circuit 42 is provided as thelight receiving circuit region 71 separately from each of the R subpixel, the G sub pixel, and the B sub pixel. However, the lightreceiving circuit 42 may also be disposed in any of the R sub pixel, theG sub pixel, and the B sub pixel. In this case, a distance between theadjacent two light receiving circuits 42 is the sensor pitch α.

In the embodiment described above, the description has been given withrespect to the structure that the pixel Pix is composed of the R subpixel, the G sub pixel, and the B sub pixel. In addition, however, asshown in FIG. 24, there is also a display device in which the pixel Pixis composed of the R sub pixel, the G sub pixel, the B sub pixel, and awhite (W) sub pixel. The present application can be applied to such adisplay device in which the pixel Pix is composed of the R sub pixel,the G sub pixel, the B sub pixel, and the W sub pixel.

When the pixel Pix is composed of the R sub pixel, the G sub pixel, theB sub pixel, and the W sub pixel, and the light receiving resolution isidentical in level to the display resolution, a basic unit 121 shown inFIG. 25 is repetitively disposed in the horizontal direction in theentire display. The basic unit 121 is composed of the pixel Pixincluding the R sub pixel, the G sub pixel, the B sub pixel, and the Wsub pixel, and one light receiving circuit region 71.

On the other hand, when the light receiving circuit regions 71 arediscretely reduced and disposed for the disposition of the pixels Pix,for example, when the light receiving circuit regions 71 are discretelyreduced and disposed so that the light receiving resolution becomes halfthe display resolution, as shown in FIG. 26, a basic unit 141 composedof two pixels Pix, and one light receiving circuit region 71 isrepetitively disposed in the horizontal direction. In this case as well,the region of the pixel Pix becomes the light portion, and the lightreceiving circuit 71 becomes the dark portion. Also, since the spatialfrequency of the repetitive pattern of the light portions and the darkportions becomes equal to or higher than 10 cpd in the horizontaldirection, the display quality can be maintained.

It should be noted that the embodiment is not limited thereto, and thevarious changes thereof may be made by those skilled in the art withoutdeparting from the gist of the present application.

In the embodiment described above, the light receiving sensors (lightreceiving circuit regions) are disposed in all the dark portions,respectively. However, the present application is not limited thereto.That is to say, for example, as shown in FIGS. 27 to 31, a lightreceiving sensor may be provided in each of dark portion regions eachbeing indicated by a reference symbol A. Also, a dummy black portionhaving no light receiving sensor disposed therein may be provided ineach of dark regions each being indicated by a reference symbol B. Inthis case, the following conditional expression (2) is established:γ=n×α  (2)

where γ is an interval between the adjacent two light receiving sensors,n is a natural number, and α is an interval between the adjacent twodark portions.

In addition, even when the interval between the adjacent two lightreceiving sensors changes as shown in FIG. 30, the above conditionalexpression (2) is established as it is. That is to say, in the case ofthe disposition as shown in FIG. 30, a correction arithmetic operationneeds to be performed in the light receiving signal portion 26 (refer toFIG. 1).

Also, as shown in FIG. 31, a dark portion region being disposed thelight receiving sensor covered with a black mask may be further providedbeing indicated by a reference symbol C.

The display device according to a change of the embodiment, as shown inFIG. 32, includes one having a flat type module shape. In this case, forexample, a pixel array portion is provided in which pixels each beingcomposed of an organic EL element, a thin film transistor, a thin filmcapacitor, a light receiving sensor, and the like are formed integrallywith one another in matrix on an insulating substrate. Also, an adhesiveagent is applied to the insulating substrate so as to surround the pixelarray portion (pixel matrix portion), and a transparent countersubstrate made of a glass or the like is stuck thereto, therebymanufacturing a display module. A color filter, a protective film, alight shielding film, or the like may be formed on the transparentcounter substrate when necessary. Also, for example, a flexible printedcircuit (FPC) may be provided as a connector through which a signal orthe like is transmitted between the pixel array portion and the outsidein the display module.

The display device of an embodiment as set forth hereinabove can beapplied to the display devices, of the information processingapparatuses in all the fields, each of which has the flat panel shape,and each of which displays thereon a video signal inputted to aninformation processing apparatus such as a digital camera, a note typepersonal computer, a mobile phone, or a video camera, or generated inthe information processing apparatus in the form of an image or a video.Hereinafter, examples of the information processing apparatus to each ofwhich such a display device is applied will be shown.

FIG. 33 shows a television receiver to which an embodiment is applied.The television receiver includes an image display screen 110 composed ofa front panel 120, a filter glass 130, and the like. The display deviceaccording to an embodiment is used in the image display screen 110,thereby manufacturing the television receiver.

FIG. 34 shows a digital camera to which an embodiment is applied. Here,an upper portion of FIG. 34 is a front elevational view, and a lowportion thereof is a rear elevational view. The digital camera includesan image capturing lens, a light emission portion 150 for flash, adisplay portion 160, a control switch, a menu switch, a shutter 190, andthe like. The display device according to an embodiment is used in thedisplay portion 160, thereby manufacturing the digital camera.

FIG. 35 shows a note type personal computer. A main body 200 of the notetype personal computer includes a keyboard 210 which is manipulated whencharacters or the like are inputted. A main body cover includes adisplay portion 220 for displaying thereon an image. The display deviceaccording to an embodiment is used in the display portion 220, therebymanufacturing the note type personal computer.

FIG. 36 shows a portable terminal apparatus to which an embodiment isapplied. Here, a left portion of FIG. 36 shows a state in which theportable terminal apparatus is opened, and a right portion thereof showsa state in which the portable terminal apparatus is closed. The portableterminal apparatus includes an upper chassis 230, a lower chassis 240, aconnection portion (a hinge portion in this example) 250, a displayportion 260, a sub display portion 270, a picture light 280, a camera290, and the like. The display device according to the embodiment isused in the display portion 260 or the sub display portion 270, therebymanufacturing the portable terminal apparatus.

FIG. 37 shows a video camera to which an embodiment is applied. Thevideo camera includes a lens 340 provided on a side face directedforward for photographing a subject, a start/stop switch 350 with whichthe photographing is started/stopped, a monitor 360, and the like. Thedisplay device according to the embodiment is used in the monitor 360,thereby manufacturing the video camera.

It should be understood that various changes and modifications to thepresently preferred embodiments described herein will be apparent tothose skilled in the art. Such changes and modifications can be madewithout departing from the spirit and scope of the present subjectmatter and without diminishing its intended advantages. It is thereforeintended that such changes and modifications be covered by the appendedclaims.

1. A display device comprising: a display circuit for displaying animage; and a light receiving sensor for detecting a light; wherein whena light receiving circuit region including said light receiving sensoris made a dark portion, and a region other than said light receivingcircuit region is made a light portion, said display circuit and saidlight receiving sensor are disposed so that a spatial frequency of arepetitive pattern of the light portions and the dark portions becomesequal to or higher than 10 cpd; and wherein when a unit of a displayresolution of an image is set as a pixel, and said dark portions arehorizontally disposed every N pixels, a width Y′ of each of said Npixels, and a width X of a region of said dark portions meet arelationship of N×W=N×Y′+X for a width W of the pixel when there is noregion of said dark portions.
 2. The display device according to claim1, wherein said display circuit and said light receiving sensor isdisposed so that the spatial frequency becomes equal to or lower than 18cpd.
 3. The display device according to claim 2, wherein an interval ofthe light receiving sensors is equal to or higher than 45 μm and equalto or lower than 1200 μm.
 4. The display device according to claim 1,further comprising a display portion which is a liquid crystal displayhaving a plurality of pixels disposed thereon in matrix.
 5. The displaydevice according to claim 1, further comprising a display portion whichis an EL display using EL elements each being adapted to performself-light emission.
 6. An information processing apparatus, comprising:display light receiving means having at least a display circuit fordisplaying an image, and a light receiving sensor for detecting a light,said display light receiving means serving to display predeterminedinformation in a form of an image and serving to detect a light throughsaid light receiving sensor; input information analyzing means foranalyzing externally inputted information by using a light receivingimage generated from a light receiving signal outputted from saiddisplay light receiving sensor; and control means for executingpredetermined control processing in accordance with a message suppliedthereto from said input information analyzing means; wherein when alight receiving circuit region including said light receiving sensor ismade a dark portion, and a region other than said light receivingcircuit region is made a light portion in said display light receivingmeans, said display circuit and said light receiving sensor are disposedso that a spatial frequency of a repetitive pattern of the lightportions and the dark portions becomes equal to or higher than 10 cpd;and wherein when a unit of a display resolution of an image is set as apixel, and said dark portions are horizontally disposed every N pixels,a width Y′ of each of said N pixels, and a width X of a region of saiddark portions meet a relationship of N×W=N×Y′+X for a width W of thepixel when there is no region of said dark portions.
 7. A displaydevice, comprising: a display circuit for displaying an image; and atleast a light receiving sensor for detecting a light; wherein when adisplay region including said display circuit is made a light portion,and a portion other than said display region is made a dark portion,said display circuit and said dark portion are disposed so that aspatial frequency of a repetitive pattern of the light portions and thedark portions becomes equal to or higher than 10 cpd, and at least apart of said dark portion is a light receiving circuit region includingsaid light receiving sensor; and wherein when a unit of a displayresolution of an image is set as a pixel, and said dark portions arehorizontally disposed every N pixels, a width Y′ of each of said Npixels, and a width X of a region of said dark portions meet arelationship of N×W=N×Y′+X for a width W of the pixel when there is noregion of said dark portions.
 8. The display device according to claim7, wherein no light receiving sensor is included in a portion other thansaid dark portion.
 9. The display device according to claim 7, wherein afollowing conditional expression is established:γ=n×α where γ is an interval of the light receiving sensors, n is anatural number, and α is an interval of the dark portions.
 10. Aninformation processing apparatus, comprising: display light receivingmeans for having at least a display circuit for displaying an image, anda light receiving sensor for detecting a light, said display lightreceiving means serving to display predetermined information in a formof an image and serving to detect a light through said light receivingsensor; input information analyzing means for analyzing externallyinputted information by using a light receiving image generated from alight receiving signal outputted from said display light receivingsensor; and control means for executing predetermined control processingin accordance with a message supplied thereto from said inputinformation analyzing means; wherein when a light receiving circuitregion including said light receiving sensor is made a dark portion, anda region other than said light receiving circuit region is made a lightportion in said display light receiving means, said display circuit andsaid light receiving sensor are disposed so that a spatial frequency ofa repetitive pattern of the light portions and the dark portions becomesequal to or higher than 10 cpd and at least a part of said dark portionis a light receiving circuit region including said light receivingsensor; and wherein when a unit of a display resolution of an image isset as a pixel, and said dark portions are horizontally disposed every Npixels, a width Y′ of each of said N pixels, and a width X of a regionof said dark portions meet a relationship of N×W=N×Y′+X for a width W ofthe pixel when there is no region of said dark portions.
 11. Aninformation processing apparatus, comprising: a display light receivingsection configured to have at least a display circuit for displaying animage, and a light receiving sensor for detecting a light, said displaylight receiving section serving to display predetermined information ina form of an image and serving to detect a light through said lightreceiving sensor; an input information analyzing section configured toanalyze externally inputted information by using a light receiving imagegenerated from a light receiving signal outputted from said lightreceiving sensor; and a control section configured to executepredetermined control processing in correspondence to a message suppliedthereto from said input information analyzing section; wherein when alight receiving circuit region including said light receiving sensor ismade a dark portion, and a region other than said light receivingcircuit region is made a light portion in said display light receivingsection, said display circuit and said light receiving sensor aredisposed so that a spatial frequency of a repetitive pattern of thelight portions and the dark portions becomes equal to or higher than 10cpd; and wherein when a unit of a display resolution of an image is setas a pixel, and said dark portions are horizontally disposed ever Npixels a width Y′ of each of said N pixels and a width X of a region ofsaid dark portions meet a relationship of N×W=N×Y′+X for a width W ofthe pixel when there is no region of said dark portions.
 12. Aninformation processing apparatus, comprising: a display light receivingsection configured to have at least a display circuit for displaying animage, and a light receiving sensor for detecting a light, said displaylight receiving section serving to display predetermined information ina form of an image and serving to detect a light through said lightreceiving sensor; an input information analyzing section configured toanalyze externally inputted information by using a light receiving imagegenerated from a light receiving signal outputted from said lightreceiving sensor; and a control section configured to executepredetermined control processing in correspondence to a message suppliedthereto from said input information analyzing section; wherein when alight receiving circuit region including said light receiving sensor ismade a dark portion, and a region other than said light receivingcircuit region is made a light portion in said display light receivingsection, said display circuit and said light receiving sensor aredisposed so that a spatial frequency of a repetitive pattern of thelight portions and the dark portions becomes equal to or higher than 10cpd, and at least a part of said dark portion is a light receivingcircuit region including said light receiving sensor; and wherein when aunit of a display resolution of an image is set as a pixel, and saiddark portions are horizontally disposed every N pixels, a width Y′ ofeach of said N pixels, and a width X of a region of said dark portionsmeet a relationship of N×W=N×Y′+X for a width W of the pixel when thereis no region of said dark portions.